Met these guys at a career fair, got a phone call not that long after that for a behavioral/resume questions. Next phone call was a technical interview, it sounded like you can get tailored questions to your language of your liking, and I went with Python since it's easy. TL;DR: Few weeks later, I was flown down to Santa Clara to do the interview, and was given 5 rounds of interviews. Range of ML questions, behavioral questions, Python questions (which I think stemmed from the fact I told them Python is my jam), CI/CD design questions. For the whole story for those interested: Round 1 was given by some PhD. Gave me some simple Python data structure wrangling exercises. While I can't say the questions specifically, it required deep knowledge of how Python dictionaries are built under the hood under specific versions (e.g. 3.6 vs 3.8). We never talked about Python 2. Solution consisted of using builtin functions (e.g. map, filter, sorted), lambdas, and a few for loops. He actually asked the same question that was asked on the second phone interview. Round 2 was given by another PhD. Asked me some tensor questions. Pretty much data cleaning/normalization across 3+ dimensions. I think the secret/trick to solving the question was to solve it using 1 dimension first, and apply it to higher dimensions. End solution was essentially 4 nested for loops, which was promptly followed up by a multi-core parallel question. Required knowledge of knowing when a mutex would be effective, when it wouldn't, and how to parallelize code. Round 3 was given by the hiring manager (lunch). He bought me lunch and we talked about my previous experience. He was especially interested in my Microsoft internships. Round 4 was probably the worst round. He was new to the team and had poorly defined questions. He asked about CI/CD design, and never seemed satisfied with my answers. As if he had difficulty phrasing his questions (I don't think english was his first language). Lots of awkward silences, so I took the opportunity to slam him with a bunch of questions to prevent him from asking me obscure CI/CD questions. e.g. Why don't you like the existing CI/CD system? What market do you think CI/CD poorly targets? What would you change about it? etc. And after that I sort of asked him about company culture/what's with the beef with Apple? He seemed happy at the end of it all. Round 5 was the most rushed round. He came in, gave me an API for some component web-like component and told me to implement some functionality given that API. It was supposed to mimic how things worked in very low level. E.g. when you read a file with system calls, you'll get interrupted a lot and you have to try again a lot. We ran out of time for this one, since I'm a slow coder and he came in late. He didn't care about syntax of my code, so I even used math notation for some of the code. At the end he told me he disliked Python LOL. Flew back. Took some finals in school, got an offer after I bombed a final. Life's good.

First, I had a Skype interview with an experienced person from the group. He generally asked questions about my resume and my background work. The first interview lasted for an hour. After that I had a technical interview with another person from the group 2 weeks later, it lasted 45 minutes.